Issues with strpos

Not quite sure what's happening here, the docs for strpos() say:

"Returns the position as an integer. If needle is not found, strpos()
will return boolean FALSE."

Looks fine, I can simply do:

if(strpos("michael", "m")

But then the docs go on to say:

"This function may return Boolean FALSE, but may also return a non-
Boolean value which evaluates to FALSE, such as 0 or "". Please read
the section on Booleans for more information. Use the === operator for
testing the return value of this function."

This seems a little inconsistent to me, means I can't do the
following:

if(strpos("michael", "z") >= 0)
{
//found it!
}

Because that always returns as found, which clearly it isn't. I can
use comparison operators to check for type, but only using "===" or "!
==".

I only want a function to tell me if the string was found (>= 0), I
don't care which position it was etc

What do others use to do this? Preferably without converting to an
array then doing an array find or something.
.

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